<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数管理</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <el-alert title="注意：只允许为第三级分类设置参数" 
            type="warning" :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>
                        选择商品分类：
                    </span>
                    <!-- 商品分类的级联选择框 -->
                    <el-cascader
                    v-model="selectCateKeys"
                    :options="catelist"
                    :props="{ expandTrigger: 'hover' ,...catProps}"
                    @change="handleChange"></el-cascader>
                </el-col>
            </el-row>
            <!-- tab页签区 -->
             <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini"
                    :disabled="isBtnDisabled" @click="addDialogVisible = true">
                        添加参数
                    </el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" 
                                :key="i" closable @close="handleClose(i,scope.row)"
                                >{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引行 -->
                        <el-table-column type="index" label="-"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCateById(scope.row.attr_id)">删除</el-button>
                                </template>
                            </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini"
                    :disabled="isBtnDisabled" @click="addDialogVisible = true">
                        添加属性
                    </el-button>
                    <el-table :data="onlyTableData" border>
                    <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" 
                                :key="i" closable @close="handleClose(i,scope.row)"
                                >{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="-"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCateById(scope.row.attr_id)">删除</el-button>
                                </template>
                            </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加' + titleText"
            :visible.sync="addDialogVisible"
            width="50%" :close-on-click-modal="false"
            @close="addDialogClosed"
            >
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
            </el-dialog>
            <!-- 修改参数对话框 -->
            <el-dialog
            :title="'修改' + titleText"
            :visible.sync="editDialogVisible"
            width="50%" :close-on-click-modal="false"
            @close="editDialogClosed"
            >
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
            </el-dialog>
    </div>
</template>

<script>
export default {
    name: '',
    data() {
        return {
            catelist:[],
            // 级联选择器的配置对象
            catProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框绑定的数组
            selectCateKeys:[],
            activeName:'many',
            // 动态
            manyTableData:[],
            onlyTableData:[],
            addDialogVisible:false,
            addForm:{
                attr_name:'',
            },
            addFormRules:{
                attr_name:[{ required: true, message: '请输入参数名', trigger: 'blur' }]
            },
            editDialogVisible:false,
            editForm:{},
            editFormRules:{
                 attr_name:[{ required: true, message: '请输入参数名', trigger: 'blur' }]
            },
            // 控制按钮与文本框的切换
            
        };
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200) return this.$message.error('获取商品分类失败')
            this.catelist = res.data
        },
        // 级联选择框选中项变化的函数
        handleChange(){
            this.getParamsData()
        },
        // Tab页签的点击处理函数
        handleTabClick(){
            this.getParamsData()
        },
        // 获取参数
        async getParamsData(){
            if(this.selectCateKeys.length !== 3){
                this.selectCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            //根据所选分类的id和当前所处面板获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                {params:{ sel:this.activeName }
            })
            if(res.meta.status !== 200) return this.$message.error('获取参数列表失败')
            
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 添加控制文本框的显示与隐藏的自定义属性
                item.inputVisible = false
                // 文本框中的输入值
                item.inputValue = ''
            })
            console.log(res.data)
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 监听对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                attr_name:this.addForm.attr_name,
                attr_sel:this.activeName
            })
            if(res.meta.status !== 201) return this.$message.error('添加参数失败')
            this.$message.success('添加参数成功')
            this.addDialogVisible = false
            this.getParamsData()
            })
        },
        // 查询当前参数的信息
        async showEditDialog(attr_id){
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{ attr_sel: this.activeName}
            })
            if(res.meta.status !==200) return this.$message.error('获取参数信息失败')
            this.editForm = res.data
            this.editDialogVisible = true
        },
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid) return
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name, attr_sel:this.activeName
                })
                if(res.meta.status !== 200) return this.$message.error('获取参数信息失败')
                this.$message.success('修改参数信息成功')
                this.getParamsData()
                this.editDialogVisible = false
            } )
        },
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        async removeCateById(attr_id){
            const confirmResult = await this.$confirm('确认删除该参数吗?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            // 确认返回值为字符串 confirm
            // 取消返回字符串 cancel
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除')
            }
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除参数失败')
            }
            this.$message.success('参数成功')
            this.getParamsData()
        },
        // 文本框失去焦点或按下回车键触发的事件
        handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return进行后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 发起请求保存操作
            this.saveAttrVals(row)

        },
        // 将attr_vals的操作保存到数据库
        async saveAttrVals(row){
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200) this.$message.error('修改参数失败')
            this.$message.success('修改参数成功')

        },
        // 点击按钮切换文本框
        showInput(row){
            row.inputVisible = true
            // 自动获取焦点
            this.$nextTick(_ => {
             this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        // 删除对应的参数和选项
        handleClose(i,row){
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
    },
    computed:{
        isBtnDisabled(){
            if(this.selectCateKeys.length !== 3){
                return true
            }
            return false
        },
        cateId(){
            if(this.selectCateKeys.length == 3){
                return this.selectCateKeys[2]
            }
            return null
        },
        // 计算标题文本
        titleText(){
            if(this.activeName === 'many')
            return '动态参数'
            else
            return '静态属性'
        },
    }
}

</script>
<style lang='less' scoped>
.cat_opt{
    margin-top: 15px;
}
.el-tag{
    margin: 8px;
}
.input-new-tag{
    width: 120px;
}
</style>